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CN- is a strong field ligand. This is due to the fact that

1. it carries negative charge
2. it is a pseudohalide
3. it can accept electrons from metal species
4. it forms high spin complexes with metal species

Correct answer: it can accept electrons from metal species

Solution

CN- is a strong field ligand because it can accept electrons from the metal species into its empty π* orbitals, leading to strong metal-ligand bonding and low-spin complexes.

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